Ok sorry guys, I got it on my own:
The answer is that the Ultrix only accepts TSL-UMD-3.1 via UDP
not TCP.
So in the Carbonite Black you have to change the Transport to UDP and the Port to 4490.
You also have to re-apply the Ultriscape-Layout to the Head to apply the changes.
I also had to swap the Tally Lamp Colors in the Ultrix-Configuration.
#Carbonite